Introduction
Building your own 2.1 inbuilt home theater system at home is not only exciting, but it also gives you the freedom to design it exactly the way you want. With simple tools, a few audio components, and a custom MDF enclosure, you can create a powerful sound system that delivers deep bass and clear vocals—perfect for music lovers and DIY makers.
In this project, I am using a TDA2030 2.1 Amplifier Board, a 30W 4-inch subwoofer, two 3-inch tweeters, and a Bluetooth audio receiver module. The enclosure is made from 12mm MDF board, ensuring strength, durability, and premium looks. By the end of this guide, you will have a fully functional 2.1 home theater system that looks impressive and sounds amazing.
Let’s start building!
Components Required
- TDA2030 2.1 Amplifier Board (30W)
- 4-inch Subwoofer (1 piece)
- 3-inch Tweeters (2 pieces)
- 12mm MDF Board (for the entire enclosure)
- 100K Potentiometers (2 pcs) – Volume & Bass
- Potentiometer Knobs
- 3D-Printed Bass Port
- Bluetooth Audio Receiver Module
- Connecting Wires
- Fevicol / Wood Glue
- Zip Sump Screws
- Hot Glue
- 12V, 12-0-12, 3A Transformer
- Sandpaper, Drill, Screws, Clamps
Step-by-Step: How I Built the MDF Enclosure & Complete 2.1 Home Theater
Step 1: Cutting the MDF Board
I used 12mm MDF board and cut the pieces as per the required measurements:
- Top Panel & Bottom Panel – 300 × 280 mm
- Middle Panels (Inside) – 280 × 115 mm × 2
- Front & Back Panels – 275 × 115 mm × 2
These pieces form the complete body of the enclosure.
Step 2: Preparing the Middle Panel for the Subwoofer
- Take one middle panel.
- Mark the center for the 4-inch subwoofer.
- Cut a circular hole for the subwoofer.
- Drill screw holes around the cut-out for mounting.
This panel will hold the subwoofer inside the box.
Step 3: Marking the Layout on the Bottom Panel
On the bottom panel, mark the guide lines at:
- 70mm
- 65mm
- 120mm
These markings help align the internal structure perfectly, just like in the reference image.
Step 4: Assembling the Internal Structure
- Take both middle panels and two side panels.
- Apply Fevicol/wood glue along the edges.
- Fix them in position on the bottom panel.
- Use clamps to hold everything firmly.
Let it dry completely.
Step 5: Filling the Gaps
To make the enclosure airtight:
- Mix Fevicol + powdered MDF waste.
- Fill all small gaps and corners properly.
- Let it dry for a few hours.
This improves bass performance by preventing air leakage.
Step 6: Attaching the Top Panel
- Apply wood glue on all top edges.
- Place the top panel.
- Use clamps again for strong bonding.
- Leave it to dry completely.
Step 7: Mounting Support Strips Inside
For a perfect internal fit of front & back panels:
- Stick 12mm MDF strips inside the opening.
- Maintain a 12mm inset from the front and back edges.
- These strips act as support for the panels to screw in later.
After drying, the enclosure becomes very solid.
Step 8: Preparing the Back Panel
- Test fit the back panel inside.
Mark and cut holes for:
- Bass port
- Antenna wire
- Power supply input
Keep the layout clean and organized.
Step 9: Preparing the Front Panel
Fit the front panel inside and mark:
- Two 3-inch tweeter holes
- Bluetooth module space
- Holes for 100K potentiometer knobs
Cut all holes neatly using a drill & hole saw.
Step 10: Painting the Enclosure
Once the raw enclosure is ready:
- Apply white primer on all sides.
- Let it dry.
- Apply black color as the final coat.
- Paint 2 to 3 layers for a smooth finish.
- Paint the front and back panels as well.
Now your home theater enclosure looks professionally made.
Step 11: Installing the Tweeters (Front Panel)
- Place the two 3-inch tweeters.
- Tighten them with screws securely.
- Insert the Bluetooth module and potentiometer knobs.
This makes the front panel ready.
Step 12: Wiring the Bluetooth Module & Amplifier Board
- Connect Bluetooth audio module → Amplifier board (as per the wiring diagram)
Connect:
- Volume potentiometer
- Bass potentiometer
I have mentioned a detailed Hindi explanation for complete connection is available on YouTube channel—readers can follow that for deeper clarity.
Step 13: Installing Subwoofer & Transformer (Back Side)
- Hot glue the 3D-printed bass port in place.
- Mount the 12V, 12-0-12, 3A transformer inside the back panel.
- Screw the 4-inch subwoofer onto the internal middle panel.
- Connect all speaker wires (left, right, and subwoofer) to the amplifier board.
- Mount the TDA2030 2.1 amplifier board on the back panel.
Step 14: Testing the System
Before closing the box:
- Power ON the transformer.
- Connect via Bluetooth.
Play music and check:
- Bass output
- Left/Right channel clarity
- Noise or distortion
If everything works correctly → Great!
If not, recheck the wiring and tighten connections.
Step 15: Final Assembly
- Screw the front panel inside.
- Screw the back panel firmly.
- Check the enclosure — it should feel solid and vibration-free.
Your 2.1 Home Theater System is now complete!
Final Step: Enjoy Your Music System
Give power to the system, pair your smartphone/laptop via Bluetooth, and start playing your favorite songs. Enjoy the deep bass, crystal-clear highs, and the satisfaction of building your own home theater system.
Congratulations—you have successfully built a stylish and powerful 2.1 inbuilt Home Theater at home!
Conclusion
Building a 2.1 inbuilt home theater system at home is one of the most rewarding DIY audio projects you can try. With the TDA2030 amplifier, MDF enclosure, 4-inch subwoofer, tweeters, and Bluetooth module, you can create a powerful sound system that looks premium and performs impressively. Every step—from cutting the MDF panels to wiring the amplifier—brings you closer to a custom-made setup that suits your personal taste.
Once assembled, the deep bass, clear vocals, and wireless connectivity make this home theater perfect for music, movies, and everyday entertainment. Most importantly, you get the joy of creating something with your own hands. Enjoy your new sound system and keep exploring more DIY projects to upgrade your audio experience!
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